[9] Review request: JDK-8162693 javapackager returns null if com.oracle.tools.packager.windows.WinAppBundler called twice

[Victor Drozdov]

Chris,

Please review the changes about WinAppBundler.

JIRA: https://bugs.openjdk.java.net/browse/JDK-8162693
Webrev: http://cr.openjdk.java.net/~vdrozdov/JDK-8162693/webrev.00/

--Victor